Automobile and carriage jack



G. H. BARKER. AUTOMOBILE AND CARRIAGE JACK.

APPLICATION FILED .IULY25, 1920.

n. l n Vnl. M uV v 2 w n I m m Uw u m mw M m .WMJ w .wm QN m IS .m .IQ PI I@ I@ I .Ifw

y mw um@ A m W y .wm S .M AL L G. R. BARKER.

AUTOMOBILE AND CARRIAGE JACK.

APPLICATIUN FILED JUl-.Y26| 1920.

` Patented Aug. L 11922.

www?.

2 SHEETS-SHEET 2.

GEORGE It. BARKER, OF JULIET, LLNOIS, ASSIGNOR TO WILLEAM E. PRATT, OE

CHICAGO,

ILLINOIS.

JLTOl'vOBILE AND CARRIAGE JACK.

ina-nist.

Application filed July 2G,

1o all whom t may concern:

Be it known that l, Geenen ll. Banaan, a citizen ot the United States,residing at Joliet, county of lVill7 and State of illinois, haveinvented certain new and useful l1nprovenients in Automobile andCarriage Jacks, of which the following is a specitication.

ln the class of jacks to which my invention relates a rack bar carryinga support for a car axle or the like is mounted to slide vertically in astandard adapted 'to he supported on a floor or pavement. T he rack baris supported at any elevation towhich it may be raised by the engagementof a pawl with the corresponding tooth of the rack. The rack har andsupport are raised and lowered by a second pawl which is pivoted on alever or handle so as to be raised or lowered the space or a tooth hyswinging the handle up and down. In the operation of raising the rackbar and support the first mentioned pawl engages the rack while the pawlpivoted on the handle is being lowered. In the operation of lowering therack7 however, the rst-rnentioned or holding pawl engages the rack asthe pawl carried by the handle moves upward out ot contact with theteeth. Means are provided whereby the action of the pawls may bereversed according as it is desired to raise or lower the rack bar. lnthe jacks in common use in order to effect such reversal of operation ithas been necessary to directly manipulate the pawls which is veryawkward and inconvenient by reason of the position ot the jack beneaththe wagon or car. lt is the object oi. my invention to produce a simple,practical and etlicient jack which may he conveniently manipulated bythe operator to change the action of the device without leaving theposition which he naturally occupies at the end of the handle whenswinging the latter. @ther features of the invention will be apparentfrom the following description of the preferred form thereon inconnection with the drawings. It is to he understood however that thespecific disclosure is ior the purpose of exeinplilication only and thatthe' scope of the invention is defined in the following claims.

In the drawings Fig. 1 is a plan oit' my improved jack partly inhorizontal section on the line 11 of Fig. 2; Fig. 2 a side elevation,partly in vertical section, thereof7 Specifica tion ol Letters Patent.

ieee. serial No. 399,137.

showing the parts in position for lifting the rack bar; Fig. 3 avertical section ot the saine partly in elevation showingthe parts inposition for lowering the rack and support; Fig. a a fragmentary sideelevation of the device; and Fig. 5 a longitudinal detail ot the handleon an enlarged scale.

1s shown in the drawings the rack bar 6 has formed integral therewithsupports 7, 8 and is vertically guided in the standard 9 having a base9a. The standard is formed with a housing 10 opening into the channel inwhich the rack bar slides and said housing is formed with an opening 11to receive the end ot the handle casting 12. The latter is :lulcruinedon a pivot pin 13 extending through the bifurcated end la ot the castingand the side walls 15 oit' the housing, said pinbemg headed over uponthe latten A traveling pawl 1G is pivoted on the pin 17 between thenieinbers ot the inner bifurcated y end of the handle casting in suchposition as to engage the teeth of the rack and the holding pawl 18 islikewise pivoted between the toi-lis oi? the handle casting on the pivot13 of the latter. Fawl 18 is formed with a tail 19 and the pawl 16 witha tail 20, and the tail of the latter is formed with an offset ear 21 inwhich is pivoted the eye 22 of a rod 237 the other end of which extendsthrough a similar ear 24: on the tail 19. lntermediate the ears 21 and24 said rod eX- tends through a perforation 25 in the end of a spring26, the other end of which is anchored to the upper wall ot the housingby a screw 27. Normally the spring 26 exerts a pull upon the rod 23 in adirection away tr in the rack and consequently the pawls are yieldinglypressed against the rack and when the handle moved up and down toreciprocate the traveling' p-awl on the handle the rack bar will moveupward stepby-step the distance of a tooth at a time in an obviousmanner. See Fig. 2.

In order to lower the rack bar and support when desired the spring 26 ispressed inward by means to be hereinafter described so that it exerts apressure against the tails of the respective pawls tending to throw thepoints of said pawls out of engagement with the rack. This operation andthe position ot the parts therefor is best shown in Fig. 3. in order tothrow the traveling pawl 16 into engagement with the rack at the upperend of its stroke, i. e., when the lever This disengagement however'does not tairev is lowered to the dotted line position in the full lineposition in 'Fig'. 3, the tail 20 of said pawl is formed on its surfaceadjacent the rack bar with a hump 28, and a spring 29 having acam-shaped upper end 30 is secured at 31 to the housing casting in suchposition that as said traveling pawl nears the upper end oit its strokethe hump on the tail thereoi engages the cammed end of the spring,throwing the tail of the pawl outward and the point thereoi inward intoengagement with the rack. ln F ig. 3 the parts are shown in full linesin the positions which theyv occupy when the `handle is lowered, or inother words when the traveling pawl is in its uppermost position and indotted lines in the other extreme position. From thedotted lines it willbe observed that as the traveling pawl is lowered the hump on .the tailthereof leaves the spring29, permitting the point of the traveling pawlto be disengaged from the rack.

place until the holdingpawl 18 is again in position to engage the rack.This movement ot the pawl 18 against the pressure 4 of the spring 26 iseected by a spring linger 32 which is pivoted at 33 upon the handlecasting and rides upon the outer or upper surface of pawl 18 at 34. Asseen` in Figs. 1, 2 and 3, the pivoted linger is-slotted at 35 andspring 26 extends loosely through the slot so as not to interfere withthe movement of the linger. For the greater partV of its movement withthe handle casting linger 32 rides upon the pawl 34. As the handleapproaches the upper limit of its movement, however, the finger engagesthe lower edge 36a oi a cover plate 36 which is secured at the upper endof the opening in the housing by the screw 27 which secures the spring26. The plate 36 is formed at its side edges with downwardly projectinglanges 3'?v which are extended at their respective lower .ends into ears38 which latter extend under lugs 39 cast upon and projecting laterally'from the housing, said lugs and ears being :for the purpose of securingthe lower edge of the plate iirmly in position. Following the action ofthe ack as shown in Fig. 3 with the spring-26 i'orced into its innerposition in which it exerts pressure tending to release the pawls fromthe rack, when the handle is elevated to the dotted line position `thepivoted finger 32 engaging the lower edge ol' the cover plate forces thepoint of the holding pawl into engagement with the rack. At about thesame time or a little while thereafter the traveling' pawl is forced outof engagement with the rack by the pressure ot spring 26. As the handleis lowered to raise the traveling pawl the hump on the tail of thelatter engages the spring 29 and forces the point of the traveling pawlinto engagement with the rack and the nger 32 having in the meantimereleased the holding pawl 18, the latter is thrown out of engagementwith the rack by the spring 26. As the handle is lifted the rackdescends with the traveling pawl until the holding pawl is again :forcedinto engagement with the rack permitting the traveling pawl to bereleased therefrom.

rlhe spring 26 may be controlled as to its two positions by any suitablemeans but I prefer to employ for this purpose a rod 39 `which is movablelongitudinally of the handle. The latter obviously might be made in onepiece with the handle casting, but preferably l i'orin the latter with asocket 40 in which the handle is removably secured by a thumb-screw 41.`The handle may be made hollow as shown, and rod 39a is guided at itsinner end through a perforation 42 into register with the spring 26. Ata convenient point toward the operating end of the handle a finger lever43 is ulcrumed in the handle at 44 and provided inside the lat-ter withan arm 45 which is pivoted to the rod 39a at 46. These parts are soproportioned and arranged that when vthe finger leveris in one extremeposition the rod 39 is withdrawn from contact with spring 26, but whenthe linger lever is in the opposite position the rod 39n 'forces spring26 into the inner position in which it is adapted to eect the loweringof the rack bar.

l claim:

1. ln a jack, a standard, a rack sliding therein, a support on the rack,a holding pawl, a hand lever, a traveling pawl' on the hand lever, alink connecting the pawls, a spring engaging the link and normallyexerting pressure thereon to force the pawls into engagement with therack, means movable longitudinally ofthe handle for shifting the springto exert pressure on the pawls tending to withdraw them from the rack,means tor throwing the holding pawl againstthe rack when the handle israised, and means for throwing the traveling pawl against the rack whenthe handle is lowered.

2. In a jack,'a standard, a rack sliding therein, a support on the rack,a holding pawl, a hand lever, a traveling pawl on the hand lever, aspring, means connecting the spring to the two pawls, said springnormally exerting pressure on both said pawls to force the latter intoengagement with the rack, means for shifting the spring to exertpressure on the pawls tending to withdraw them from the rack, a pivotedVfinger" on the handle and engaging the hold-- 3. In a jack, a standard,a rack sliding therein, a support on the rack, a holding pawl, a handlever, a traveling pavvl on the hand lever, a link connecting the pawls,a housing enclosing the pawls and in which the hand lever is pivotedhaving an opening through 'Which the hand lever extends, a springsecured to the casing extending par tially over said opening andengaging the link and means movable longitudinally of the handle adaptedto engage said spring and move it inward to a position in which it tendsto retract the pawls.

et. In a jack, a standard, a rack sliding therein, a Support on therack, a holding pawl, a hand lever, a traveling pawl on the hand lever,a link pivoted to one of said paWls and loosely engaging the other, ahousing enclosing the paWls and in Which the hand lever is pivoted, saidhousing having an opening through which the hand lever extends, a springsecured at one end to the housing above the opening therein, extendingpartially over the opening and engaging the link, a linger pivoted tothe hand lever, extending through the opening and engaging the holdingpand, and longitudinally movable means on the handle for engaging saidspring and moving it to a position Where 1t tends to retract the pavvls.

GEORGE R. BAKKER.

